lower left in plate: Drawn by J. H. Mortimer; lower center in plate: Killing an Enemy. / London Publish'd as the Act directs 15th Nob. 1779, by R. Blyth No. 27 Great Castle Street, Cavendish Square; lower right below plate: Etched by R. Blyth; by later hand, lower right in graphite: Box 38 T
(Campbell Fine Art, London, 4 May 1992); Donald Vogler, Portland, OR; gift to NGA, 2017.
- Sunderland, John. "John Hamilton Mortimer: His Life and Works," Walpole Society 52 (1988): no. 71.4